/* --- High-End Glassmorphism UI Layout Panels --- */
.app-hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px;
    transition: opacity 0.5s ease;
}

.app-hud.hidden { opacity: 0; pointer-events: none; }

.hud-widget {
    pointer-events: auto;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    padding: 16px 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
}

.controls-widget {
    position: absolute;
    top: 24px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.hud-icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition-smooth);
    background: rgba(255, 255, 255, 0.1);
}

.hud-icon-btn:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.2);
}

/* Modal System Architecture */
.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.hidden { opacity: 0; pointer-events: none; }

.dynamic-modal {
    width: 90%;
    max-width: 800px;
    height: 80vh;
    background: var(--bg-glass);
    backdrop-filter: blur(25px);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 24px 64px rgba(0,0,0,0.15);
    position: relative;
    overflow-y: auto;
    color: var(--text-primary);
    transform: scale(1);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.hidden .dynamic-modal { transform: scale(0.95); }